Television apparatus



Patented Aug. 7, 1934 UNITED STATES TELEVISEON APPARATUS Dners von Mihzilly, Brlin-Wfilmetsdorf Germany, assignor to the firm I. M. K. Synclioate Limited,

1Lomlon, England Application Augus 6, 1932Serial N0. 627,699 1 In Germany May 21, 1932 11 Claims.

My invention relates to television scanning apparatus.

'Ihis application is a continuation in part-of my former application Serial N0. 602,972 filed 5 April 4, 1932, entitled Television apparatus.

An objectof the parent applioation is so de scribe scanning apparatus comprising a stationary mernber provided with peripherally disposecl scanning elements for analyzing o1 recombining an image, and a rotary reflector for projecting the image onto the analyzing member, or for receiving an image from the recombining member, as the case may be. With the apparatus thele dSC1ibd, the rotary reflector is arranged at an angle o1 about 45 to the axis of theclriving motor, as a result of which the image is, for example on transmitting, not only rotatezcl about the axis of the motor for variable projection on the stationary analyzing memberibu t also re volves once inits plane for eaoh revolution 017 the motor.

For compensating this revolution of the irriage in its plane I have as sei: forth ir1 the parent application, provided a c'orrecting prism, arranged intermediat e the refiectorand the ob-' jective of the apparatus, anal adaptecl to Iotate ab halfthe speed of the'reflector.-Jli has been found, however, that the additiori ofthis 00xrecting prism intr0duces practical difficultiesin operation. For rotating the prism a seconcl motor must be prdVicled which should revolv'e at xaotly half the speed of the motor oarrying the reflector, and it has been found rather difficult to secure anal maintain this precise rota ry relation between the two motors, An additional objection to 1';he correcting prism result'sfrom the increasecl length of optical paths traversed by the scanning beam within the apparatus thus' introduced, so that either increased. light-losses must be acceptecl or the optical parts of the apparatus must be ma-de very large. v

The object of my present invention is to everoome these drawbacks by eliminating ehe eo:- recting prism itself. T0 this end Ehe stationary member, which may be a drumhaving spaoed about peripherally a plurality of scanning elements, such as having a helical row of apertures relatively positioned for analyzing o1 recombining an image, is combihed With a coaxial rotary refleotor having a plane its reflecting surface substantially parallel 130 its axis of rotation. The image is projected onto this rotary refleotor or vice Versa, by a corner mirror fixed to the inside Wall of the drum. The rocary mirror having its 55 reflecting surfaces parallel so its axis of rotation does not cause any revolution of the image in its plane, so that the correcting prism is rendered superfiuous and all the difiiculties counected with the addition, arran'gement and driving of this prism are avoicled.

In the accompanying drawing apparatus emboolying my invention is illustrated diagrammatically loy way o1 example.

F1'g. 1 is an elevation of my televi'sion receiving apparatus.

Fig. 2 is a sectional plane view of the Same.

Fig.'3 is a ho'rizontal section of a television transmitting apparatus in acc'sordalice with my irivention.

Referring to Figs. 1 and 2, 1 is the statio1iary dr ur&shaped analyzing or recombining memoer provided with a helical row of scanning elemen ts or apertures 5. In the centre of this drum and coaxial therewith a rotary reflector 2 is provided which is driven by the motor 3, the entire': unit being of small mass in relation co the dru.m. This refiectoris arrangeo'l so that its reflecting surfac'es a1 e substantially parallel to its axis df 10tation as shown, Surrounding drum l, 4 is a photo-cell of helical shape so that it covers all the aperti1res 5.

' 'I'he ligl1t rays falling through th e aperuures 5 011 the reflector 2 are projecteol byit ontO the o orner mir1or6, affixed to the inside wallof the drumfl in the space between two neighroouring ape'rtures 5, and are reflected to the objctive 7 for projection onbo a screen.

With the tr a'nsmitter shown in Fig. 3 the arrangement is substantially the Same except that the glow-lam1ti 4 is replaced by a photocell of ehe same shape. It would also be possible to u'se the same corner mirror here butthereby lange light-losSes would be introduced owing to the small area of the mirror placed in the space between adjacent apertures of the drum, as here the mirror has to reflect the entire picture while in. thereceiver only single picture points are refiected one after the other. Thereforeit is advantageous 130 use a mirror of larger size in the tra'nsmitter. As such mirror would cover some f the apertures of the drum it has 130 be provided With corresponding ape1tures 8 enabling the passage of the light-rays from the rotary mirror 2 toapertures 5.

By means of the apparatus accdrding to my invention it is also possible to control the definition of the picture during the transmission. To this e1'1d another corner mirror 9 is arranged diametrically oppositely to the corner mirror 6. Each time the rotary mirror 2 comes into horizontal position the entire image is refiected from the corner mirror 6 onto the corner mirror 9 and therefrom 130 the opaque glass plate 10 whereby the condition of focus can be continually observed by the 1ens 11.

I claim:

1. Television apparatus comprising a stationary eircular member having spaced aboui; it peripherally a plurality of scanning elements relatively positioned for scanning, and a coaxial rotary refleetor arranged 1:0 provide for reflection therefrom occurring along lines located. in planes substantially perpendicular to the rocary axis, an optieal path progressively established between contiguous areas 015 a scannecl field and said spaced elements in succession.

2. Television apparatus comprising an electreoptical translating device, a stationary drum having spaced about it peripherally a plurality of scanning elements relatively positioned for scanning, and a rotary reflecting member, arranged coaxially within the drum, and cooperating with said spaced elements progressively to establish, by reflection from said member occurring in a plane substantially perpendicular 110 the rotary axis, an optical path between said translafiing device and successive elemental areas of a scanned field.

3. Television apparatus comprising an electrooptical translating device, an objective, a stationary druni having spaeed about it peripherally a plurality of scanning elements relatively positioned for scanning, and. a rocary refiecting member, arra)n:ecl coaxially within the drurn, and. cooperating with said spaced elements progressively to establish, by reflection from said member oceurring in a plane substantially perpendicular to its rotary axis, an optical path between said translating device and successive elemental areas of said objective.

4. Television apparatus comprising an electro optical translating device, an objeci ive, and means for progressively establishing an optical path between said translating device and successive elemental areas of the objeetive, comprising, a stationary drum having spaced about it peripherally a plurality of scanning elements relatively positionecl for scanning, a -rotary reflecting member, arranged coaxially within Ehe drum, and cooperating With said spaced elements 1:0 establish said optical path by reflection from said member oco11rring in a plane substantially perpendicular to its rtary axis, and a stationary refiector positioned to .clirect the optica1 path at an angle between the rotary reflecting'member and the objective. v

5. Television apparatus comprising a stationary drum having a helical row of apertures for scanning, and a coaxial rotary reflector arranged Within the drum adapted progressively to establish, by reflection therefrom occurring in a plane substantially pe1pendicular 130 its rotary axis, an opti'cal path between contiguous elemental areas Cf a scanned field and said apertures successively.

6. Television apparatus comprising an electrooptieal translating device, a stationary drum having a helical row of apertures for scanning, and a rotary refleeting member arranged ooaxially within bhe drum and cooperating with said apertures progressively to establish, by refiection from said member occurring in a plane substantially perpendicular to its rotary axis, an optical path between said translating device and successive elemental areas of a seanned field.

7. Television apparatus comprising a stationary drum having a helical row of apertures for scanning, an electrooptieal translating device surrounding the drum in alignrrient with said apertures, a rotary refiecting member arranged coaxially within the drum and cooperating With said apertures progressively to establish, by refiection from said member ocourring in a plane substantially perpendicular 1:0 the rotary axis, an optical path between said translating clevice and successive elemental areas of a scanned field.

8. Television apparatus comprising an electrooptical translating device, an objeotive, a stationary drum having a helical row of apertures for scanning, and a rotary reflecting member arranged coaxially Within the drum and cooperating With said apertures progressively eo establish, by reflection from said rotary member occurring in a planesubstantially perpendieular with its axis, an opcical path between said translating device and successive elemental areas of said objective.

9. Television apparatus comprising an electrooptical translating device, an objective, and means for progressively establishing an optical path between the said translatingdevice andsuccessive elemental areas of said objective, comprising, a stationary drum having a helical row o1 apertures, a rotary reflecting member arranged coaxially-within the drum and cooperating with the apertures 130 establish said optical path by refiection from said member occurring in a plane substantially perpenclioular to ahe rotary axis, and a stationary refiector positioned to direct the optical path at an angle between the rotary refiecting member and said objective.

10Television apparatus comprising an electroojatidal translating device, an objective, and means for progressively establishing an optical path between the translating device and suocessive elemental areas 013 said objectivecornpris ing, a stationary dr1i'm having a helical row of apertures, a rotaryreflecting member arranged coaxially Within the dru1n and cooperating witli the apertures to establish said optical path by refiectio'n from said member occurring in a plane substantially perpendicular to the rotary axis a mirror fixed 130 the inner wa1l of said drum for directing the optical path at an angle between the rotary reflecting member and said objective, a second mirror arranged within the drum opposite to the firso for projecting an image from said objective onto a second objective.

11. Television appa1atus oomprising a stationary substantially oircular member having spaced' about ic peripherally a plurality 015 scar'1ning elements relatively positionedfor seanning, and a refieotor mounted torotate aboui; an 'axis substantially parallel to the axis cf said member and having every element of its refiecting surface extending in the direction of the axis substantially linear and parallel to said axis, to provide by refieotion therefrom an opticai path progressively established between eontiguous areas of a scanned field and said spaced elendents in succession.

DENES vor: MII-ILY. 

